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Polyplodia Valette, 1907, p. 61

Diagnostic Features	Diplopodia in which  ambulacral plates are trigeminate adorally but become quadrigeminate adapically.
Distribution	Upper Jurassic, Europe
Type	Diadema versipora Woodward, 1856, explanation to plate 2, by original designation.
Species Included	Valette mentions just one other species in establishing this genus P. versipora (Woodward, 1856); Oxfordian, western Europe P. aroviensis Thurman; Oxfordian, Germany.
Classification and/or Status	A subjective junior synonym of Diplopodia M'Coy, 1848.
Remarks	Valette, A. 1907. Revision des echinides fossiles de l'Yonne. Bulletin de la Societe des Sciences historiques et naturelles de l'Yonne 60 [for 1906], 9-191.